The energy factor ef indicates a water heater s overall energy efficiency based on the amount of hot water produced per unit of fuel consumed over a typical day.
Water heater energy factor vs thermal efficiency.
Expressed as a decimal the uniform energy factor is determined by running a department of energy specified simulated use test sut.
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The energy factor is currently used for rating the efficiency of water heaters dishwashers clothes washers and clothes dryers.
The two figures are related but different.
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An older measure of water heater overall efficiency that is being phased out due to new test methods for water heaters.
That means that 58 60 of the energy that is being used to heat your water is effectively converted into heat.
Adjustments in new doe testing procedures now impact water heating performance stats associated with the amount of hot water produced in a real world situation to the length of typical showers.
Ef is determined by the department of energy s test method outlined in the 10 cfr parts 200 to 499 edition revised as of january 1 2014.
They use less energy than standard models saving homeowners money on their utility bills while helping protect the climate.
They can be 8 14 more energy efficient for homes that use a lot of hot water around 86 gallons per day.
Examples of performance factors impacted by uef include.
The new uef standard affects more than just the efficiency number itself.
The higher the ef value is the more efficient the water heater.
The uniform energy factor.
Use the energy factor to determine the energy efficiency of a storage tankless or demand type water heater or heat pump water heater.
Add up your savings.
Energy star certified water heaters are an easy choice for energy savings performance and reliability.
The term is used by the united states department of energy to develop and enforce minimum energy conservation standards under.
For homes that use 41 gallons or less of hot water daily demand water heaters can be 24 34 more energy efficient than conventional storage tank water heaters.
An energy factor is a metric used in the united states to compare the energy conversion efficiency of residential appliances and equipment.
What energy efficiency rating factors have changed.
Energy factor calculates the amount of energy delivered as hot water compared to the energy consumption of a residential water heater over a 24 hour period.
The uniform energy factor for residential and certain commercial water heaters refers to its efficiency when run under standardized conditions for a 24 hour period.
On the contrary thermal efficiency is the amount of energy delivered as heated water compared to the energy consumption of the water heater.
